Starting now (15th december) Yami Marik lvl 50 will start appearing in Duel World (DM). He will not appear at the gate, but appear in the overworld, just like Arkana, The Rare Hunter and Yami Marik did before.
Once you beat Yami Marik lvl 50, you will receive one copy of The Winged Dragon of Ra, there will be no need to farm him and rely on luck to get your copy (The victory rewards from lvl 50 are the same as lvl 40). But if you fail to beat Yami Marik you might have to wait a few hours before getting another shot at him (assuming his spawn will work the same way Arkana and the Rare hunter did in the overworld, otherwise you might be able to speed up his spawn rate by gaining event points).
Yami Marik lvl 50 will have the skill “Incarnation of The Winged Dragon of Ra - Sphere Mode”. This skill allows Yami Marik to start out with a copy of “The Winged Dragon of Ra - Sphere Mode” on his side of the field. What this means is that he can immediately bring out his Winged Dragon of Ra with 4000 atk and 4000 def at the start of the duel (without paying any life points), which makes it a very powerful skill. Because Yami Marik will still have all his life points when he brings out Ra, it’s very likely he’ll use Ra’s effect (by paying 1000 life points) to destroy your monsters. (Marik won’t be able to raise Ra’s attack past 4000 by paying life points because that effect can only be activated when he is normal summoned)
Although you can’t attack The Winged Dragon of Ra - Sphere mode or target it with effects, you can target The Winged Dragon of Ra with card effects. This means you’ll have to fill your deck with enough powerful cards to have a good chance that you have some way to deal with Ra in your opening hand. (note: although Ra’s effect says “When Normal Summoned, other cards and effects cannot be activated.” this effect is over as soon as Ra is summoned, AND in the case of Sphere Mode, Ra is special summoned and not normal summoned)
Cards that can quickly deal with The Winged Dragon of Ra
If you go first you can’t attack yet, and since he’ll likely use Ra’s effect to destroy your monsters there is almost no use in summoning anything on your first turn (unless you have a card like Order to charge), that’s why Windstorm of Etaqua is great to survive and stall a turn.
If you go first and you can bring out this monster you immediately take care of Ra because even though The Winged Dragon of Ra - Sphere Mode can’t be targeted by effects, Dakini doesn’t actually targets but rather forces your opponent to send a monster to the graveyard. If you have access to a Cyber Angel deck, this could be a sure way to victory.
Just like the example with a Cyber Angel deck, you could run a Ninja deck and banish Ra with Black Dragon Ninja’s effect. Even if your Black Dragon would be removed from the field (by yourself or your opponent) , Ra won’t come back since he can’t be special summoned (and the effect from Black Dragon Ninja says that they are Special summoned to the field).
Standard Alien deck. Marika has to go first. Then you need to put an alien counter on ra and use that are card that destroys a monster that has an Alien counter on it.do that your first turn and you will have won.